CN-117800478-B - Method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater, which is characterized in that safe and nontoxic cysteine is selected as a reaction starter, and meanwhile, the reaction is rapidly started and the pH range of the traditional Fenton reaction is widened, cu 2+ is selected as a reaction enhancer, fe 3+ /Fe 2+ circulation is accelerated, the phenol is rapidly degraded, and simultaneously, the degradation of other organic pollutants is synergistically improved, no complex and high-cost iron-containing activator is required to be prepared and added, a small amount of iron contained in the wastewater is used as a source of Fe 2+ , and the cyclic utilization is formed in a system, so that the pollutant removal speed is greatly improved, and the generation of iron mud is reduced. The technology has the advantages of green and high efficiency, simple and convenient operation and low cost.

Inventors

• JIANG FENGCHENG
• SI CHENGYUAN
• JIANG YINGLEI
• CHEN QIANQIAN
• ZHANG CHUANBING
• FENG QIANQIAN
• WANG MINGSHI
• WANG LUYAO
• ZHANG YICHEN
• JIN YU
• Tian Panyang
• WU JINGBING

Assignees

• 华夏碧水环保科技股份有限公司
• 河南理工大学

Dates

Publication Date

20260508

Application Date

20231228

Claims (5)

1. 1. A method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater is characterized by comprising the following steps: Adding inorganic acid into the phenolic wastewater containing Fe 3+ , and adjusting the pH value of the phenolic wastewater; step (2), adding copper salt and cysteine into water, stirring and dissolving to obtain a composite solution, then dripping the composite solution into phenolic wastewater, and uniformly stirring; step (3), dropwise adding the H 2 O 2 aqueous solution into the phenolic wastewater obtained in the step (2) to degrade pollutants in the phenolic wastewater; the molar concentration of Cu 2+ in the composite solution in the step (2) is 0.01-0.05mmol/L, and the molar concentration of cysteine is 0.01-0.1mmol/L; The molar concentration of Fe 3+ in the phenol-containing wastewater in the step (1) is not less than 0.005mmol/L.
2. 2. The method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater according to claim 1, wherein the inorganic acid in the step (1) is hydrochloric acid, nitric acid or sulfuric acid, and the pH of the phenol-containing wastewater is adjusted to 2-5.
3. 3. The method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater according to claim 1, wherein the copper salt in the step (2) comprises any one or a combination of copper chloride and copper sulfate.
4. 4. The method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater according to claim 1, wherein the molar concentration of H 2 O 2 in the phenol-containing wastewater in the step (3) is controlled to be 2-4mmol/L.
5. 5. The method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater according to claim 1, wherein the temperature in the degradation is controlled to be 15-40 ℃ in the step (3), and the degradation time is controlled to be 1-10min.

Description

Method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater Technical Field The invention relates to the technical field of wastewater treatment, in particular to a method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater. Background The industries such as chemical industry, pharmacy, chemical synthesis and the like can generate a large amount of phenol-containing wastewater, phenol pollutants have strong toxicity, and the untreated phenol-containing wastewater is discharged to the nature to seriously harm an ecological system and threaten human health, so that the development of a high-efficiency low-cost phenol-containing wastewater treatment technology is necessary. The current treatment technology of phenol-containing wastewater mainly comprises three major categories of a physical method, a chemical method and a biological method, wherein the chemical oxidation method has the advantages of high treatment rate, strong feasibility and the like. The most widely used chemical oxidation process is the Fenton oxidation process based on H 2O2. Although H 2O2 has strong oxidizing property, refractory organics such as phenols are still difficult to be directly oxidized and degraded by H 2O2. Therefore, an additional activator is often required to generate hydroxyl radicals (HO.) with strong oxidability, so that phenolic compounds in water are oxidatively degraded into small molecular organic matters or mineralized into carbon dioxide and water. The main active component of various activating agents used at present is generally iron ions or iron-containing compounds, and the substance with the activating effect is Fe 2+. Patent CN113845201B discloses a method for treating phenolic wastewater based on activating H 2O2 by using a Si-Fe/gamma-Al 2O3 activator, which obtains a better treatment method, wherein Si element is taken as a cocatalyst, fe element is taken as an active component, gamma-Al 2O3 is taken as a carrier to prepare a catalyst, and the preparation process requires the processes of crushing, high-temperature calcination, stirring and the like, so that the process is complex, the required raw materials are various in variety and high in energy consumption, the implementation difficulty and the operation cost of the technology are greatly improved, and the popularization of the technology is not facilitated. Patent CN111068641B discloses a method for treating phenolic wastewater by activating H 2O2 by adopting an activator composed of CeO 2、Fe2O3、CuO、MnO2 and noble metals, which solves the problem of low COD (chemical oxygen demand) efficiency in phenolic wastewater degradation by the existing activator, and the preparation of the activator needs drying, roasting at different temperatures and other processes, and the noble metals such as Ru, au, pt and the like are required to be added, thus the method has the defects of complex process and high cost. Iron, which is the fourth element of abundance ranking in the crust, is widely present in nature and in water, and is susceptible to oxidation-reduction reactions, and is widely used in water treatment processes. The iron in the phenolic wastewater is utilized to treat phenolic compounds in the wastewater, so that the phenolic compounds have practical application value in the aspects of cost reduction and efficiency enhancement of wastewater treatment. Disclosure of Invention Technical problem to be solved Aiming at the defects of the prior art, the invention provides a method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater, which can greatly improve the treatment rate of the phenol-containing wastewater by utilizing Fe 3+ in the phenol-containing wastewater to activate H 2O2 for reaction treatment of the phenol-containing wastewater without adding an iron-containing activating agent. Technical proposal A method for rapidly degrading phenol by utilizing iron in phenol-containing wastewater comprises the following steps: And (1) adding inorganic acid into the phenolic wastewater containing Fe 3+ to adjust the pH of the phenolic wastewater, and dissolving and releasing Fe (OH) 3 precipitated in the wastewater into Fe 3+ after the wastewater is adjusted to be acidic, wherein the reaction mechanism is as follows, fe (OH) 3+3H+＝Fe3++3H2 O. Adding copper salt and cysteine (Cys) into water, stirring and dissolving to obtain a composite solution, then dripping the composite solution into phenolic wastewater, and stirring uniformly, wherein the cysteine (Cys) reduces Fe 3+ into Fe 2+, and meanwhile, the cysteine and iron ions form a complex, so that the solubility of the iron ions at different pH values is increased, and the reaction mechanism is as follows: Fe3++Cys→Fe2+。 Fe 2+ +Cys→ FeCys (iron ion-cysteine complex). And (3) dropwise adding the H 2O2 aqueous solution into the phenolic wastewater to degrade pollutants in the phenolic wastewater. Fe 2+ generated in the reaction